811021950 has 96 divisors (see below), whose sum is σ = 2240615520. Its totient is φ = 215712000.

The previous prime is 811021927. The next prime is 811021951. The reversal of 811021950 is 59120118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811021951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 945922 + ... + 946778.

It is an arithmetic number, because the mean of its divisors is an integer number (23339745).

Almost surely, 2^811021950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811021950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120307760).

811021950 is an abundant number, since it is smaller than the sum of its proper divisors (1429593570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811021950 is a wasteful number, since it uses less digits than its factorization.

811021950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579 (or 1568 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 811021950 is about 28478.4471135629. The cubic root of 811021950 is about 932.5616161994.

The spelling of 811021950 in words is "eight hundred eleven million, twenty-one thousand, nine hundred fifty".